TI introduces industry’s most accurate current shunt monitor

25th August 2011

ES Admin

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Texas Instruments has introduced the industry’s most accurate current shunt monitor. With a maximum offset voltage of 10-microvolts (uV) and a maximum gain error of 0.1%, the INA226 is 10 times more accurate than leading competitors. The device is a complete 16-bit, single-chip solution, and provides fully programmable measurements for current, voltage and power across a digital I2C interface. The INA226 benefits designers working with servers, telecom equipment, computers, power management devices and testing equipment, where accurate power measurements are crucial.

Complete single-chip solution provides 10 times greater accuracy than competitors

Key features and benefits
Single-chip digital solution with I2C interface provides current, voltage and power measurements, simplifying board design and layout constraints with no external mux or ADC required.
Industry leading accuracy with a maximum offset voltage of 10-uV and maximum gain error of 0.1 percent results in greater precision at low currents and allows for using smaller shunt resistors, reducing I*R loss.

Independently programmable conversion times and sample averaging make it easy to customize to the speed requirements of each system, and reduce software and memory requirements.
Maximum quiescent current of 420-uA and maximum shutdown current of 2-uA result in efficient operation that consumes 3.5 percent less power than competitors’ discrete solutions, even with the INA226’s integrated ADC and power mux.
140-dB common mode rejection ratio (CMRR) and 36-V common mode voltage (CMV) ensure there is little to no change in offset voltage throughout the entire range of operation, simplifying error analysis.